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Topic: Wiring problems with vintage MXR Phase 90-(Script Bud 1974) |
Al Vesel
From:
Chisholm, Minnesota, USA
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Posted 27 May 2010 3:10 pm |
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I was hoping someone on the forum could look at these pictures and tell me where to hook the 2 wires from the 9 volt battery. The connector that hooks to the battery broke off of the terminals to where they belong on the pedal itself. It came in that way. So I can't tell where they go to.
It looks like one of the wires would hook to the input terminal. Is that correct? And if that is the case, where would the other one hook to? The output terminal, the pot or where?
And lastly, the other pictures you can see that the dial for the amount of phase came off. When I wanted to buy this, because it's supposedly was an early vintage one, or what they call the Script Bud (1974), I had the seller take it apart to check the numbers on the pot. When they did that, they said they broke the wire off of the battery terminals. I thought that's ok, I can fix that (which is what I asked you about at the beginning of this email), but they also said that they can't figure out how to put the dial back into the top, and that it doesn't stay in. What keeps the shaft locked into the pot? Hopefully they didn't pull hard and break something. I don't know much about these things.
Of course, that dial goes down into the pot. Hopefully it isn't ruined and maybe there is just a little keeper or snap ring that would hold it in place. That is the shaft into the pot, where it can't pull out. They told me that the dial stills works. But, of course, with the battery posts not being on yet, I can't tell. But I can tell you that I can put the shaft into the pot and it doesn't stop at a particular point, like for full phase and no phase. It should, I would think.
Maybe someone can help me by telling me where the battery wires (black and red) get hooked up to, and then I'll try and figure the pot and shaft out.
I emailed this to Ken Fox, but with the holiday I don't know if he'll be around and maybe someone can help me out with some idea.
TXS
If you need you can contact me at 218-254-2082 or cell 218-969-0739.
TXS,
Al Vesel
Email: alvesel@mchsi.com
Phone: 218-254-2082
Cell: 218-969-0739
_________________
Emmons LeGrande SKH D-10 - WALKER STEREO STEEL AMP w JBL ENCLOSURES & TC ELECTRONICS M-ONE XL PROCESSOR, HILTON VP,FURMAN POWER CONDITIONER, SARNO's Steel Guitar BLACK BOX,BJS,ToneMaster bars,FENDER Strat, FENDER & Ovation acoustic's |
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Danny Bates
From:
Fresno, CA. USA
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Posted 27 May 2010 5:10 pm
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Al,
It looks like the red wire goes directly to the battery, so look close at the input jack tabs for evidence of a broken wire. It should have a connector that turns off the battery when unplugged. It already looks like a solder mess on the tab next to the yellow wire might be it.
You might want to check the pic of a clone (below) and see it it's from the board.
Basically the positive terminals on the ic's need the positive and the ground on the ic's is negative.
Last edited by Danny Bates on 27 May 2010 5:35 pm; edited 1 time in total |
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John Groover McDuffie
From:
LA California, USA
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Posted 27 May 2010 5:28 pm
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Hi Al, here is a picture of my script logo Phase 90. I have labeled where the red wire connects to the board, since it is hard to tell the red from orange in this pic. The black wire goes to the "ring" connection on the input jack. On mine it is the solder tab that is "on top" when you hold the pedal upside down as pictured.
Be careful not to use too much heat when soldering to the printed circuit board and solder quickly, the solder pads and traces can come off the board if they get overheated |
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Larry Bressington
From:
Nebraska
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Posted 27 May 2010 5:46 pm
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15 watt iron preffered on PCB.
A lot of times the red wire will be on the input jack, as it has a battery or transformer option, also look at the transformer jack if it has one.
You should be able to see some broken 'seams' there.
_________________
A.K.A Chappy. |
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John Groover McDuffie
From:
LA California, USA
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Posted 27 May 2010 6:39 pm
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| Larry Bressington wrote: |
also look at the transformer jack if it has one.
You should be able to see some broken 'seams' there. |
This pedal does not have a "transformer" aka DC-in jack.
Al I forgot to mention regarding the potentiometer: Looking at mine it doesn't appear that there is any clip ring on the end of the shaft that sticks through the back of the pot body. My guess is that that hole is kind of crimped around the end of the shaft, but there might be some other part inside that holds the shaft in.
Your best bet would probably be to replace the pot. If you need me to I can measure mine and see what value you need. Of course save the old broken one as it having the original will help maintain the best resale value, these are collectible. |
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Al Vesel
From:
Chisholm, Minnesota, USA
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Posted 29 May 2010 12:39 am MXR Phase 90
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John,
Per the email I sent you, here are the pics. I couldn't send pics thru the forum email system.
Please look at and see if you can help me w/ the questions on the email. Maybe you can shoot me your regular email address in case I have more questions. I surely would appreciate it. TXS to all that are helping also.
I got the wires soldered and it is working. I just can'd hold the shaft in the pot. I am hoping I don't have to replace the pot as it will diminish the value of the phase shifter.
TXS
AL
_________________
Emmons LeGrande SKH D-10 - WALKER STEREO STEEL AMP w JBL ENCLOSURES & TC ELECTRONICS M-ONE XL PROCESSOR, HILTON VP,FURMAN POWER CONDITIONER, SARNO's Steel Guitar BLACK BOX,BJS,ToneMaster bars,FENDER Strat, FENDER & Ovation acoustic's |
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Ken Fox
From:
Nashville GA USA
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Posted 29 May 2010 3:53 am
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| Most of the time those shafts will pop back into place with a bit of pressure. It might be best to take the back off the pot and check it out first. |
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Al Vesel
From:
Chisholm, Minnesota, USA
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Posted 1 Jun 2010 6:23 pm MXR Phase 90
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Thought I had everything worked out. Now when I plug it in the phase works for about 10 seconds and then it loses the phase and only straight guitar comes out and real week at that. And it's not the battery. That is the first thing I thought so I replaced it tweice with 2 new batteries.
I was informed that most likely it is a bad capacitor.
I couldn't fix this myself. So to even send it away to Dunlop, which I don't think I would anyway, they want $50.00 to look at it and repair plus freight there and back. And they don;t know if they can repair. They don't have any old parts from the 70's But they will look and let me know.
But things are not looking good at this point. Ready to throw in the towel. Getting too expensive to repair.
TXS
Al Vesel
alvesel@mchsi.com
_________________
Emmons LeGrande SKH D-10 - WALKER STEREO STEEL AMP w JBL ENCLOSURES & TC ELECTRONICS M-ONE XL PROCESSOR, HILTON VP,FURMAN POWER CONDITIONER, SARNO's Steel Guitar BLACK BOX,BJS,ToneMaster bars,FENDER Strat, FENDER & Ovation acoustic's |
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John Groover McDuffie
From:
LA California, USA
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Posted 1 Jun 2010 10:48 pm
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| You are wrapping the circuit board in something non-conductive when you assemble the pedal, aren't you? If not you should be. The foam falls apart. I just used a piece of t-shirt material. |
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Al Vesel
From:
Chisholm, Minnesota, USA
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Posted 2 Jun 2010 12:13 am Wiring problems with vintage MXR Phase 90-(Script Bud 1974)
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John,
I used some new foam. So I am replacing it with some black foam. Like I said, I thought I had it all figured out and put it back together using some new foam. Then it worked for only around 5-10 seconds and then the phase disappeared. So then I took the board back out of the foam and tired it and still only 5-10 seconds and then the phase goes away, only normal signal then and not that strong of a signal. Then I thought maybe I didn't have a good weld again on the board so I took some new wire and bypassed the red & black wires and went from the battery to the area on the board that is where the contacts should be. And the same thing, it only works for a few seconds and then loses its' phase again.
So there you go. I'm at a loss other than thinking it is a capacitor. Any suggestions would be great.
TXS so much,
Al
_________________
Emmons LeGrande SKH D-10 - WALKER STEREO STEEL AMP w JBL ENCLOSURES & TC ELECTRONICS M-ONE XL PROCESSOR, HILTON VP,FURMAN POWER CONDITIONER, SARNO's Steel Guitar BLACK BOX,BJS,ToneMaster bars,FENDER Strat, FENDER & Ovation acoustic's |
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Matthew Keon
From:
Chicago, IL
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Posted 2 Jun 2010 7:07 am
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| Al - I sent you an email regarding this.. |
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